Interesting that Microsoft is so eager to support enough syscalls for non-GUI developers. But I wonder how much this increases the attack surface of both Windows and the WSL Linux.
It may not be the only reason, but my thoughts from the start were that if this flushes out enough, getting Linux containers (docker) on windows in a native way could be a big win, and even bigger in Azure's space. I really liked the approach that Joyent took to getting Docker/Linux containers on their Solaris fork.